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In situ SR-CT Experimental Study on the Directional Sintering of High-Temperature Superconductor YBCO Materials in the Microwave Fields

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Acta Metallurgica Sinica(English Letters) 2022年第1期35卷 67-77页

作者： Liangyuan Wang Lei Shen Yongcun Li Yuanjie Wang Yu Xiao Xingyi Zhang Feng Xu Xiaofang Hu CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsCAS Center for Excellence in Complex System MechanicsUniversity of Science and Technology of ChinaAnhui230027China Key Laboratory of Mechanics on Disaster and Environment in Western China Attached to the Ministry of Education of China Lanzhou UniversityLanzhou730000China Shanxi Key Lab of Material Strength&Structural Impact College of Mechanical and Vehicle EngineeringTaiyuan University of TechnologyTaiyuan030024China

YBa_(2)Cu_(3)O_(7-x)(YBCO)is a kind of high-temperature superconducting material that has important application in information,energy,medical treatment,etc.,and the superconducting properties of YBCO are closely related to its internal *** this study,the microwave heating method was adopted to prepare the YBCO *** internal 3 D online evolution observation based on the synchrotron radiation computed tomography technology shows that there was directional grain growth phenomenon of YBCO during microwave sintering *** local regions with special microstructure,these particles grew to the same ***,the theoretical models of single and multiple particles in the microwave electromagnetic fields were *** on these theoretical models and finite element analysis,it shows that the YBCO particles can modulate the distribution of electromagnetic fields,resulting in the significantly higher electric field intensity at the particle junctions than other ***,there were very high electric field intensity and temperature gradients in the directions of particle *** factors were crucial in directional *** results will provide theoretical basis and technical guidance for the controllable preparation and performance optimization of the internal microstructure of superconducting materials in the preparation process.

关键词： Synchrotron radiation computed tomography Microwave sintering Microstructure In situ

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Task-Space Riccati Feedback based Whole Body Control for Underactuated Legged Locomotion

arXiv

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arXiv 2024年

作者： Yang, Shunpeng Hong, Zejun Li, Sen Wensing, Patrick Zhang, Wei Chen, Hua School of System Design and Intelligent Manufacturing Southern University of Science and Technology China Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology China Department of Aerospace and Mechanical Engineering University of Notre Dame United States

This manuscript primarily aims to enhance the performance of whole-body controllers(WBC) for underactuated legged locomotion. We introduce a systematic parameter design mechanism for the floating-base feedback control within the WBC. The proposed approach involves utilizing the linearized model of unactuated dynamics to formulate a Linear Quadratic Regulator(LQR) and solving a Riccati gain while accounting for potential physical constraints through a second-order approximation of the log-barrier function. And then the user-tuned feedback gain for the floating base task is replaced by a new one constructed from the solved Riccati gain. Extensive simulations conducted in MuJoCo with a point bipedal robot, as well as real-world experiments performed on a quadruped robot, demonstrate the effectiveness of the proposed method. In the different bipedal locomotion tasks, compared with the user-tuned method, the proposed approach is at least 12% better and up to 50% better at linear velocity tracking, and at least 7% better and up to 47% better at angular velocity tracking. In the quadruped experiment, linear velocity tracking is improved by at least 3% and angular velocity tracking is improved by at least 23% using the proposed method. © 2024, CC BY-NC-SA.

关键词： Angular velocity

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OVERCONSTRAINED LOCOMOTION

arXiv

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arXiv 2023年

作者： Sun, Haoran Huang, Bangchao Zhang, Zishang Xu, Ronghan Huang, Guojing Feng, Shihao Huang, Guangyi Yin, Jiayi Qiu, Nuofan Chen, Hua Zhang, Wei Pan, Jia Wan, Fang Song, Chaoyang Department of Mechanical and Energy Engineering Southern University of Science and Technology China Department of Computer Science The University of Hong Kong Hong Kong School of Design Southern University of Science and Technology China ZJU-University of Illinois Urbana-Champaign Institute Zhejiang University China System Design and Intelligent Manufacturing Southern University of Science and Technology China Design & Learning Research Group Southern University of Science and Technology China

This paper studies the design, control, and learning of a novel robotic limb that produces overconstrained locomotion by employing the Bennett linkage for motion generation, capable of parametric reconfiguration between a reptile- and mammal-inspired morphology within a single quadruped. In contrast to the prevailing focus on planar linkages, this research delves into adopting overconstrained linkages as the limb mechanism. The overconstrained linkages have solid theoretical foundations in advanced kinematics but are under-explored in robotic applications. This study showcases the morphological superiority of Overconstrained Robotic Limbs (ORLs) that can transform into planar or spherical limbs, exemplified using the simplest case of a Bennett linkage as an ORL. We apply Model Predictive Control (MPC) to simulate a range of overconstrained locomotion tasks, revealing its superiority in energy efficiency against planar limbs when considering foothold distances and speeds. The results are further verified in overconstrained locomotion policies optimized from Reinforcement Learning (RL). From an evolutionary biology perspective, these findings highlight the mechanism distinctions in limb design between reptiles and mammals and represent the first documented instance of ORLs outperforming planar limb designs in dynamic locomotion. Future studies will focus on deploying the model-based and learning-based overconstrained locomotion skills in the robotic hardware to close the Sim2Real gap for developing evolutionary-inspired, energy-efficient control of novel robotic limbs. © 2023, CC BY-NC-ND.

关键词： Deep reinforcement learning

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Integration of SDN and Digital Twin for the Intelligent Detection of DoC Attacks in WRSNs

arXiv

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arXiv 2025年

作者： Qaisar, Muhammad Umar Farooq Yuan, Weijie Han, Guangjie Ahmed, Adeel Liu, Chang Piran, Md. Jalil School of Computer Science Northwestern Polytechnical University China School of System Design and Intelligent Manufacturing Southern University of Science and Technology China Department of Internet of Things Engineering Hohai University China School of Computer Science and Technology University of Science and Technology of China China School of Information Engineering Guangdong University of Technology Guangzhou China Department of Computer Science and Engineering Sejong University Seoul05006 Korea Republic of

Wireless rechargeable sensor networks (WRSNs), supported by recent advancements in wireless power transfer (WPT) technology, hold significant potential for extending network lifetime. However, traditional approaches often prioritize scheduling algorithms and network optimization, overlooking the security risks associated with the charging process, which exposes the network to potential attacks. This paper addresses this gap by integrating Software-Defined Networking (SDN) and Digital Twin technologies for the intelligent detection of Denial of Charging (DoC) attacks in WRSNs. First, it leverages the flexibility and intelligent control of SDN, in combination with Digital Twin, to enhance real-time detection and mitigation of DoC attacks. Second, it employs four key metrics to detect such attacks including charging request patterns, energy consumption, behavioral and reputation scores, and charging behavior and efficiency. The numerical results demonstrate the superior performance of the proposed protocol in terms of energy usage efficiency, survival rate, detection rate, and travel distance. © 2025, CC BY.

关键词： State of charge

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Pressure-assisted Silver Sintering Structure Optimization for Power Modules 5

Pressure-assisted Silver Sintering Structure Optimization fo...

引用

5th International Conference on Optoelectronic science and Materials, ICOSM 2023

作者： Zhang, Hao Xing, Yulong Gao, Lilan Liu, Zheng Tan, Yansong Lu, Guoquan Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China National Demonstration Center or Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China Tianjin Yixunyuan New Material Technology Co. Ltd. Tianjin300380 China School of Chemical Engineering Tianjin University Tianjin300350 China School of Materials Science and Engineering Virginia Polytechnic Institute and State University BlacksburgVA24061 United States

ISBN: (纸本)9781510674547

As mobile technology evolves from 5G to 6G, the demand for third-generation semiconductors such as SiC with higher power and frequency capabilities is increasing. Silicon Carbide power modules generate significant heat during operation, requiring large-area nano-silver sintering technology to improve module performance and reliability. However, in large-area sintering processes, low exhaust efficiency of solder paste by-products and uneven sintering pressure of the nano-silver paste result in poor sintering quality of the silver layer. This study aims to improve the sintering quality of interconnected silver layers by optimizing the sintering pressure distribution and adding rubber spacers to the sintering structure. ABAQUS was used to quantitatively analyze the effects of pressure methods and gasket material, diameter, and thickness on the stress distribution in the silver layer. Finally, based on the simulation results, an optimized sintering structure was proposed to unify the pressure and reduce the stress concentration in the silver layer, and verified experimentally by sintering tests. Compared with the traditional sintering structure, the application of a 2 mm thick fluoro rubber gasket with the same surface area as the silver layer in the optimized structure reduced the porosity to 2.15% and achieved a more dense sintered silver layer. © 2024 SPIE.

关键词： Finite element method

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Adaptive control method of HVAC for uniformizing comfort at Japanese residential living rooms using deep reinforcement learning

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2021年第3期141卷 373-382页

作者： Sakuma, Yuiko Nishi, Hiroaki Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Department of System Design Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

There is a great demand for high-quality indoor thermal environments while achieving comfort and saving the energy for heating, ventilation, and air conditioning (HVAC) devices offer a tradeoff. The room shapes, partitioning, and the location of diffusers cause uneven comfort and degrade thermal satisfaction. Therefore, an HVAC control method that provides uniform thermal comfort while saving energy is required. In such cases, providing uniform comfort in a room can be a low-cost and energy-efficient solution. We propose a deep reinforcement learning (DRL)-based HVAC control method to uniformize comfort in a room. The proposed method considers the use of sensors, which are already deployed in existing HVAC devices and is adaptive to rooms with different conditions. The proposed method controls the HVAC device based on the prediction of the room's thermal response using wall heatmaps of the target room. The heatmaps are obtained by using a simple measuring system of an infrared thermopile array sensor. For evaluating the proposed method's adaptivity to rooms with different conditions, a computer flud dynamics (CFD)-based simulation was designed. The coldest period throughout a year was chosen as the evaluation period;uniformizing comfort is the most difficult when the temperature difference between outside and inside a room and the validity of the proposed method for the other periods is implied. The usefulness of the proposed method for the chosen period was shown for the selected period;the proposed method achieved an improvement of 33.9% in thermal comfort performance while on average increasing energy consumption by 6.3%, against that of comparable approaches. Moreover, the comfort performance during learning is confirmed to be similar to those of the existing method. © 2021 The Institute of Electrical Engineers of Japan.

关键词： Energy management systems

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Purchasing behavior prediction model for real stores considering product cluster and time-series patterns

IEEJ Transactions on Electronics, Information and Systems

引用

IEEJ Transactions on Electronics, Information and systems 2021年第3期141卷 471-482页

作者： Sakuma, Yuiko Yoshida, Masahiro Nishi, Hiroaki Graduate School of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan Department of System Design Faculty of Science and Technology Keio University 3-14-1 Hiyoshi Kohoku-ku Yokohama223-8522 Japan

Recently, cashless payment services have been rapidly introduced, increasing the demand for recommender systems for real stores. Recommender systems have been well-studied and successful in many Internet services. While factors such as the diversity and coverage of products should be considered, the prediction accuracy of user purchasing behaviors is the most crucial factor in a recommender system. This research proposes a purchasing behavior prediction model for real stores by using purchase history data collected from a supermarket in Saitama City, Japan, as a part of a smart city project. Time-series patterns in purchasing behavior indicate the sales characteristics of supermarkets, where daily products are predominately purchased. For example, some users repeatedly purchase specific products in a certain period or purchase different products from their previous visit. Many previous studies have only considered the compatibility between the features of users and items;however, this work also models the time-series patterns of purchasing behavior. The proposed prediction model adopts ensemble learning, in which weak learners learn the two factors (the compatibility between users and items) and time-series patterns of purchasing behavior separately. Moreover, product names in supermarkets often contain meta-information of the product alongside the item name. For instance, the product name "three tomatoes from Gunma Prefecture" includes information about the quantity and manufacturer as well as the item name "tomato". However, products that are the same item but have different product names are likely to be purchased together in the context of purchasing activity, thus deteriorating the prediction accuracy. Therefore, a product classification method is proposed to categorize the products for each item. The experimental results show 3.2% and 10.6% improvements in the precision-recall area under the curve (PR-AUC) for the proposed method compared to models that consid

关键词： Recommender systems

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Development And Optimization of Airborne Display Scene Based on SCADE 4

Development And Optimization of Airborne Display Scene Based...

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4th International Academic Exchange Conference on science and technology Innovation, IAECST 2022

作者： Song, Qian Zhang, Li Tian, Ze Xi'an Polytechnic University School of Electronic Information Shaanxi xi'an710600 China Key Laboratory of Aviation Science and Technology on Integrated Circuit and Micro-System Design Shaanxi xi'an710068 China

ISBN: (纸本)9798350320008

With the rapid development of avionics display field, the traditional graphics software development method can no longer meet the needs of high security and efficiency. This paper studies a development method based on SCADE Display, a high security graphics application development tool, analyses the principle and characteristics of SCADE Display, applies SCADE Display to design airborne display scene models, and tests, analyses and optimizes the process on a home-made test platform. Finally, the experimental results show that the optimized solution can effectively improve the development efficiency and graphics frame rate, and also verify the adaptability and functionality of the home-made platform. © 2022 IEEE.

关键词： Software design

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Robust Surface Reconstruction of Plant Leaves from 3D Point Clouds

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Plant Phenomics 2021年第1期3卷 28-42页

作者： Ryuhei Ando Yuko Ozasa Wei Guo Graduate School of Science and Technology Keio UniversityJapan School of System Design and Technology Tokyo Denki UniversityJapan International Field Phenomics Research Laboratory Institute for Sustainable Agro-ecosystem ServicesGraduate School of Agricultural and Life SciencesThe University of TokyoTokyoJapan

The automation of plant phenotyping using 3D imaging techniques is ***,conventional methods for reconstructing the leaf surface from 3D point clouds have a trade-off between the accuracy of leaf surface reconstruction and the method’s robustness against noise and missing *** mitigate this trade-off,we developed a leaf surface reconstruction method that reduces the effects of noise and missing points while maintaining surface reconstruction accuracy by capturing two components of the leaf(the shape and distortion of that shape)separately using leaf-specific *** separation simplifies leaf surface reconstruction compared with conventional methods while increasing the robustness against noise and missing *** evaluate the proposed method,we reconstructed the leaf surfaces from 3D point clouds of leaves acquired from two crop species(soybean and sugar beet)and compared the results with those of conventional *** result showed that the proposed method robustly reconstructed the leaf surfaces,despite the noise and missing points for two different leaf *** evaluate the stability of the leaf surface reconstructions,we also calculated the leaf surface areas for 14 consecutive days of the target *** result derived from the proposed method showed less variation of values and fewer outliers compared with the conventional methods.

关键词： shape separation sugar

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Research on The Parametric Solid Modeling Method of Solid Rocket Motor for Multiphysics Simulation 13

Research on The Parametric Solid Modeling Method of Solid Ro...

引用

13th International Conference on Mechanical and Aerospace Engineering, ICMAE 2022

作者： Ren, Jiaren Bao, Fu-Ting Wei, Ran Dai, Lin Zhang, Jiandong Northwestern Polytechnical University Science and Technology on Combustion Internal Flow and Thermal-Structure Laboratory Xi'an710072 China Beijing System Design Insitute of the Electro-Mechanic Engineering Beijing100000 China

ISBN: (数字)9781665472357

ISBN: (纸本)9781665472357

Solid Rocket Motor (SRM) design engineers urge for a method that can design SRM with high efficiency and realize the adjustment of the parameters within limits, aiming at roughly evaluating the quality characteristics of the SRM and rapidly getting the multi-physics fields used for working process simulation under the circumstances of the burning regression. Based on the Creo platform, this paper proposed a standard process for parametric design of SRM and tracking the burning regression by utilizing the concept of Top-down modeling and the method of feature modeling respectively. Additionally, the function of modifying parameters, regenerating models, and exporting files was encapsulated in programs by the secondary development of Creo, avoiding the complexity and tediousness of manual operation. © 2022 IEEE.

关键词： design

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